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Local Wave Field Synthesis by Spatial Band-Limitation in the Circular/Spherical Harmonics Domain

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The achievable accuracy of sound field synthesis (SFS) techniques, such as Wave Field Synthesis (WFS), is mainly limited in practice due to the limited loudspeaker density. Above the so called spatial aliasing frequency, considerable artifacts are introduced in the synthesized sound field. In local SFS, the accuracy within a local listening area is increased at the cost of degradations outside. In this paper a new approach for local WFS is proposed. The WFS driving functions are computed based on an order-limited harmonics expansion of the target sound field. A local listening area is created around the shifted expansion center where the synthesized sound field exhibits higher accuracy. The size of the local area is controlled by the expansion order of the driving function. The derivations of 2D, 3D, and 2.5D driving functions are given, and the synthesized sound fields are evaluated by numerical simulations.

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AES - Audio Engineering Society